What is the time difference between Sydney and Seoul?

Seoul is 1 hour behind Sydney. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Seoul from Sydney?

Between 10:00–18:00 in Sydney, which is 09:00–17:00 in Seoul. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Sydney observe daylight saving time?

Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.

Does Seoul observe daylight saving time?

No. Seoul stays on UTC+9 all year, so its clocks never move.

If it is midday in Sydney, what time is it in Seoul?

It is 11:00 in Seoul, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Sydney and Seoul use?

Sydney uses Australia/Sydney, currently UTC+10 (AEST), and Seoul uses Asia/Seoul, currently UTC+9. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Sydney time to Seoul time

Seoul is 1 hour behind Sydney right now, so midday in Sydney lands in the morning in Seoul.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

Every hour of a day in Sydney, and what the clock reads in Seoul at that same moment.

Sydney	Seoul
00:00	23:00previous day
01:00	00:00
02:00	01:00
03:00	02:00
04:00	03:00
05:00	04:00
06:00	05:00
07:00	06:00
08:00	07:00
09:00	08:00
10:00	09:00
11:00	10:00
12:00	11:00
13:00	12:00
14:00	13:00
15:00	14:00
16:00	15:00
17:00	16:00
18:00	17:00
19:00	18:00
20:00	19:00
21:00	20:00
22:00	21:00
23:00	22:00

Daylight saving time

Seoul keeps one offset all year while Sydney moves twice. That is the whole reason this difference is seasonal.

Sydney

Observes daylight saving time

Standard: UTC+10
Daylight: UTC+11
Next change: 2026-10-04 +60m

Seoul

Does not observe daylight saving time

Standard: UTC+9

When you can actually talk

The window is 8 hours wide — 10:00–18:00 in Sydney, 09:00–17:00 in Seoul.

Sydney 10:00–18:00Seoul 09:00–17:00

Reference

The zone identifiers and offsets behind everything above.

	Sydney	Seoul
IANA zone	Australia/Sydney	Asia/Seoul
Abbreviation	AEST	UTC+9
Standard offset	UTC+10	UTC+9
Daylight offset	UTC+11	—
Clock changes this year	2	0
Country	Australia	South Korea

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Sydney and Seoul?: Seoul is 1 hour behind Sydney. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Seoul from Sydney?: Between 10:00–18:00 in Sydney, which is 09:00–17:00 in Seoul. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Sydney observe daylight saving time?: Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.
Does Seoul observe daylight saving time?: No. Seoul stays on UTC+9 all year, so its clocks never move.
If it is midday in Sydney, what time is it in Seoul?: It is 11:00 in Seoul, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Sydney and Seoul use?: Sydney uses Australia/Sydney, currently UTC+10 (AEST), and Seoul uses Asia/Seoul, currently UTC+9. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.